Practice
Numerical
Work and rate practice
Work problems are about rates: how much of a job is done per hour. Rates add up; times don't.
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Choose the correct answer
19 workers build a wall in 18 days. How many days would 18 workers take, working at the same rate?
Pick an answer
The first 10 questions of each category are free.
Tips for Work and rate
- If a job takes 6 hours, the rate is 1/6 of the job per hour.
- Working together: add the rates, then take the inverse to get the time.
- Pipes that empty a tank have a negative rate.